<template>
  <div class="all-goods">
    <div class="goods">
      <div class="menu-wrapper" ref="menuWrapper">
        <ul>
          <li
            v-for="(item,index) in goods"
            :key="item.id"
            class="menu-item"
            :class="{'current': currentIndex === index}"
            @click="selectMenu(index,$event)"
          >
            <span class="text border-1px">
              <span v-show="item.type > 0" class="icon" :class="classMap[item.type]"></span>
              {{item.name}}
            </span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper" ref="foodsWrapper">
        <ul>
          <li v-for="item in goods" class="foods-list foods-list-hook" :key="item.id">
            <h1 class="title">{{item.name}}</h1>
            <ul>
              <li
                v-for="food in item.foods"
                class="food-item border-1px"
                :key="food.id"
                @click="selectFood(food,$event)"
              >
                <div class="icon">
                  <img width="57" height="57" :src="food.icon" />
                </div>
                <div class="content">
                  <h2 class="name">{{food.name}}</h2>
                  <p class="desc">{{food.description}}</p>
                  <div class="extra">
                    <span class="count">月售{{food.sellCount}}份</span>
                    <span>好评率{{food.sellCount}}%</span>
                  </div>
                  <div class="price">
                    <span class="now">￥{{food.price}}</span>
                    <span v-show="food.oldPrice" class="old">￥{{food.oldPrice}}</span>
                  </div>
                  <div class="cartcontrol-wrapper">
                    <cartcontrol :food="food" />
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>

      <shopcart
        :selectFoods="selectFoods"
        :deliveryPrice="seller.deliveryPrice"
        :minPrice="seller.minPrice"
      ></shopcart>
    </div>
    <food :food="selectedFood" ref="food"></food>
  </div>
</template>

<script>
import BScroll from "better-scroll";
import shopcart from "@/components/shopcart/shopcart";
import cartcontrol from "@/components/cartcontrol/cartcontrol";
import food from "@/components/food/food";

const ERR_OK = 0;

export default {
  props: {
    seller: {
      type: Object
    }
  },
  components: {
    shopcart,
    cartcontrol,
    food
  },
  data() {
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      selectedFood: {}
    };
  },
  created() {
    this.classMap = ["decrease", "discount", "special", "invoice", "guarantee"];
    this.$http.get("http://www.sell.com?action=goods").then(response => {
      response = response.body;
      if (response.errno === ERR_OK) {
        this.goods = response.data;
        this.$nextTick(() => {
          this._initScroll();
          this._calculateHeight();
        });
      }
    });
  },
  computed: {
    currentIndex() {
      for (let i = 0; i < this.listHeight.length; i++) {
        let height1 = this.listHeight[i];
        let height2 = this.listHeight[i + 1];
        if (!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
          return i;
        }
      }
      return 0;
    },
    selectFoods() {
      let foods = [];
      this.goods.forEach(good => {
        good.foods.forEach(food => {
          if (food.count > 0) {
            foods.push(food);
          }
        });
      });
      return foods;
    }
  },
  methods: {
    selectMenu(index, event) {
      if (!event._constructed) {
        return;
      }

      let foodList = this.$refs.foodsWrapper.getElementsByClassName(
        "foods-list-hook"
      );
      let el = foodList[index];
      this.foodScroll.scrollToElement(el, 300);
    },
    selectFood(food, event) {
      if (!event._constructed) {
        return;
      }

      this.selectedFood = food;
      this.$refs.food.show();
    },
    _initScroll() {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {
        click: true
      });
      this.foodScroll = new BScroll(this.$refs.foodsWrapper, {
        probeType: 3,
        click: true
      });

      this.foodScroll.on("scroll", pos => {
        this.scrollY = Math.abs(Math.round(pos.y));
      });
    },
    _calculateHeight() {
      let foodList = this.$refs.foodsWrapper.getElementsByClassName(
        "foods-list-hook"
      );
      let height = 0;
      this.listHeight.push(height);
      for (let i = 0; i < foodList.length; i++) {
        let item = foodList[i];
        height += item.clientHeight;
        this.listHeight.push(height);
      }
    }
  }
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped lang='stylus' rel="stylesheet/stylus">
@import '../../common/style/mixin.styl';

.goods {
  display: flex;
  position: absolute;
  top: 174px;
  bottom: 46px;
  width: 100%;
  overflow: hidden;

  .menu-wrapper {
    flex: 0 0 80px;
    width: 80px;
    background: #f3f5f7;

    .menu-item {
      display: table;
      width: 56px;
      height: 54px;
      line-height: 14px;
      padding: 0 12px;

      &.current {
        position: relative;
        // z-index: 10;
        margin-top: -1px;
        background: #fff;
        font-weight: 700;

        .text {
          border-none();
        }
      }

      .icon {
        display: inline-block;
        width: 12px;
        height: 12px;
        vertical-align: top;
        margin-right: 2px;
        background-size: 12px 12px;
        background-repeat: no-repeat;

        &.decrease {
          bg-image('decrease_3');
        }

        &.discount {
          bg-image('discount_3');
        }

        &.guarantee {
          bg-image('guarantee_3');
        }

        &.invoice {
          bg-image('invoice_3');
        }

        &.special {
          bg-image('special_3');
        }
      }

      .text {
        display: table-cell;
        font-size: 12px;
        width: 56px;
        border-1px(rgba(7, 17, 27, 0.1));
        vertical-align: middle;
      }
    }
  }

  .foods-wrapper {
    flex: 1;

    .title {
      padding-left: 14px;
      height: 26px;
      line-height: 26px;
      border-left: 2px solid #d9dde1;
      font-size: 12px;
      color: rgb(147, 153, 159);
      background: #f3f5f7;
    }

    .food-item {
      display: flex;
      margin: 18px;
      padding-bottom: 18px;
      border-1px(rgba(7, 17, 27, 0.1));

      &:last-child {
        border-none();
        margin-bottom: 0;
      }

      .icon {
        flex: 0 0 57px;
        margin-right: 10px;
      }

      .content {
        flex: 1;

        .name {
          margin: 2px 0 8px 0;
          height: 14px;
          line-height: 14px;
          font-size: 14px;
          color: rgb(7, 17, 27);
        }

        .desc, .extra {
          margin-bottom: 8px;
          line-height: 10px;
          font-size: 10px;
          color: rgb(147, 153, 159);
        }

        .desc {
          margin-bottom: 8px;
          line-height: 12px;
        }

        .extra {
          .count {
            margin-right: 12px;
          }
        }

        .price {
          font-weight: 700;
          line-height: 24px;

          .now {
            margin-right: 8px;
            font-size: 14px;
            color: rgb(240, 20, 20);
          }

          .old {
            text-decoration: line-through;
            font-size: 10px;
            color: rgb(147, 153, 159);
          }
        }

        .cartcontrol-wrapper {
          position: absolute;
          right: 0;
          bottom: 12px;
        }
      }
    }
  }
}
</style>
